Pipe identification help

[topfuel443]

Ok guys, trying to sort some of this Macs stuff out. 

Here’s what I know: 

All pipes pictured have an O.D. Of 2.25” at the widest point. 

All of them have a .875” O.D. Header pipe, except for the two that have the weld on them (the one in my Mono, and the second one from the left), they both have a 1” OD head pipe. 

There are two of them that have a flat 1” long band in the belly. 

What the the heck do I have here? I’m fairly sure I have it figured out, but want to hear from you guys. The one pipe that is brand new and uncut measures 16-5/8” long for reference, the others have obviously been cut at some point. 

 

[Danny King]

All the 1” band pipes are macs 15 cc pipes

all the zero band pipes are macs 13cc pipes. 

Just a cpl of the 13cc pipes have a 1” head pipe welded on. 

All those are great pipes and all those are excellant on 91/101 engines. 

 

[Rudy Formanek]

What Danny said. Some will say the 13cc with 7/8 lead in tube will work well on 80's and even 67's.